var myWebViewer = new PDFTron.WebViewer({
documentType: "pdf",
path: 'lib',
}, viewerElement);
var binary_string = window.atob(base64encodedString);
var len = binary_string.length;
var bytes = new Uint8Array(len);
for(var i = 0; i < len; ++i) {
bytes[i] = binary_string.charCodeAt(i);
}
var blob = new Blob([bytes], {type:'application/pdf'});
var url = URL.createObjectURL(blob);
viewerElement.addEventListener('ready', function() {
myWebViewer.loadDocument(url);});